Answer:
Igneous rocks are generally massive, crystalline, shiny and hard rock with broken joints. They are composed mainly of primary minerals such as quartz, feldspars and hornblende.
Answer:
Five types of bacteria are: Coccus, Bacillus, Spirillum, Rickettsia, and Mycoplasma.
Answer:
Mutualism: It is a type of symbiotic relationship between two organisms in which both the organisms gets benefits to each other.
For example, in leguminous plants a bacteria is present in the roots of the plants and make symbiotic relationships with each other. In this relationship, plant provides habitat and food to the bacteria and in return the bacteria fixes atmospheric nitrogen for the plant and both get benefit.
A. Pressure receptors in the stomach walls signal fullness or emptiness
